The GARDENA gardening expert
Both plants have been infested with mildew, Ms. M. As to the treatment, I would recommend the use of environmentally-friendly fungicide (e.g. Net-Sulphur WG, Atempo Copper-FungusFree, both from Neudorff). The application time period for your blackberries is from March until July and for the vine, from May to August.
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